Roof ventilator of the forced air draft type



April 1958 1.15. DOHERTY 2,831,416

ROOF VENTILATOR OF THE FORCED AIR DRAFT TYPE Filed Aug. 17, 1955 ROOF VENTILATOR OF THE FORCED AIR DRAFT TYPE Lewis Stirling Doherty, Baton Rouge, La. Application August 17, 1955, Serial No. 529,041

g 6 Claims. or. 98-43) This invention relates to a roof ventilator of the forced air draft type. The main objects and advantages of this invention are:

First, to provide a roof ventilator which may be assembled as a unit and is adapted to be supportedly positioned on roof curbs varying considerably in diameter.

Second, to provide a ventilator which while effectively serving its purpose as a ventilator is low and inconspicuous.

Third, to provide a roof ventilator having these advantages and which is of large capacity in proportion to I its size.

Fourth, to provide a roof ventilator in which the air is discharged horizontally and close to the roof so that ordinary wind conditions do not materially affect its capacity as a ventilator.

Objects relating to details and economies of the invention will appear from the description to follow. The invention is defined and pointed out in the claims.

A preferred embodiment of the invention is illustrated in the accompanying drawing, in which:

Fig. 1 is a fragmentary view partially in section in line 11 in Fig. 2 of a roof ventilator embodying my invention installed on a roof which is conventionally illustrated.

Fig. 2 is a fragmentary plan view.

Fig. 3 is a fragmentary elevational view of a modified form or embodiment of my invention.

In the accompanying drawing 1 represents a roof formed of concrete and provided with a ventilator curb 2. 3 represents the roof covering material.

The ventilator of my invention comprises a base plate 4 desirably formed of sheet metal and having a central flue opening 5 therein. The base plate is provided with a downturned flange-like rim at its outer edge. This base plate is of such diameter that it may be supportedly positioned on curbs varying substantially in diameter. Ordinarily anchoring bolts are not required but if desired anchoring bolts may be provided for the base plate and positioned to meet the requirement of the particular roof or curb on which the base plate is mounted.

The hood designated by the numeral 7 in the embodiment illustrated in Figs. 1 and 2 is provided with a flat top 8 and downwardly diverging side walls 9. The top is provided with downturned flanges 10 at its edges lapped on the side walls and secured thereto as by the sheet metal screws 11. At their lower edges the walls 9 are provided with outturned flanges 12. The hood is supported and vertically spaced relative to the base plates by means of the posts or spools 13 through which the bolts 14 are passed, the bolts extending through the flange in the hood and base plate.

The combined motor support and flue 15 is preferably cylindrical and open at its ends having outturned flanges 16 at its upper end disposed against the under side of the base plate and secured thereto by the bolts 2.7 which also secure the conical fan inlet 18 having outturned flanges .19 at its lower end receiving the bolts. The motor 20 is embraced by the supporting member 21 having radial arms 22 fixedly secured to the inner side of the member 15. One of the attaching bolts or rivets being indicated at 23. The motor is disposed centrally within the support 15 with its shaft 24 disposed vertically and projecting upwardly to receive the fan 25, a centrifugal blower type of fan being commonly used and conventionally illustrated. This fan opens to the fan inlet 18 and discharges horizontally against the downwardly diverging Walls of the hood. The air discharged from the fan is directed downwardly upon the base plate and is discharged horizontally between the lower edges of the hood side walls and the base plate.

In the embodiment of my invention shown in Fig. 3 the base plate is circular and has a generally conical downturned peripheral flange 26. The hood 27 is concavo-convex in shape and is supported on the base plate by the posts 28 corresponding to the posts 13. In this embodiment the fan inlet 29 is curved inwardly. In other respects the structure is substantially that illustrated in detail in Figs. 1 and 2.

The ventilator of my invention may be very economically produced and installed and as stated is adapted to be installed on curbs varying substantially in diameter. This greatly reduces the number of sizes required to meet varying installing conditions.

As far as applicant is aware roof ventilators have heretofore been manufactured in a large number of sizes to be installed on curbs of specified dimensions and frequently special manufacture is required to fit a particular curb. Applicants ventilator as stated is adapted for installation on a wide variety of curb sizes. It greatly reduces stock requirements. Applicants ventilator is relatively inconspicuous when installed even on roofs without a parapet and quite close to the edge thereof.

I have illustrated and described my invention in a highly practical embodiment thereof. I have not attempted to illustrate or describe other adaptations or embodiments which I contemplate, as I believe this disclosure will enable those skilled in the art to embody or adapt my invention as may be desired.

Having thus described the invention, what is claimed as new and is desired to be secured by Letters Patent is:

1. A roof ventilator assembly comprising a base plate having a central opening therein and being of such diameter as to permit its being supportedly positioned on roof curbs of substantially varying diameters, said base plate having a downturned flange at its outer edge, a hood comprising a fiat top and downwardly diverging side walls provided with outturned flanges at their lower edges, laterally spaced hood supporting posts carried by said base plate and supporting the hood with its edges spaced vertically from the base plate and inwardly relative to the edge of the base plate so that air discharged from the hood is directed horizontally by the'base plate, a cylindrical motor support member constituting a flue mounted on said base plate in surrounding relation to said central opening therein and to depend from the base plate within the curb on which the base plate is mounted,

an upwardly tapering annular fan inlet mounted on said base plate in surrounding relation to the opening therein and constituting an extension for said flue, a motor mounted centrally within said motor support member with its shaft disposed vertically and projecting upwardly therefrom, said motor being provided with angularly spaced radially extending supporting arms carried by said motor support member, and a centrifugalfan mounted on said shaft within said hood and above said flue to discharge horizontally against said downwardly diverging hood side walls.

2. A roof ventilator assembly comprising a base plate having a central opening therein and being of such diassume meter as to permit its being supportedly positioned on roof curbs of substantially varying diameters, a hood comprising a flat top and downwardly diverging side walls, laterally spaced hood supporting posts carried by said base plate and supporting the hood-with its edgeslspaced vertically from the base plate and inwardly relative to the edge, of the base plate so that air discharged from the hood is directed horizontally by the base plate, a motor support member constituting a line mounted on said base plate in surrounding relation to said central opening therein and to depend from the base. plate within a curb on which the base plate is mounted, an annular fan inlet mounted on said base plate in surrounding relation to the opening therein and constituting an extension for said flue, a motor mounted centrally within said motor support member with its shaft disposed vertically and projecting upwardly therefrom, and a centrifugal fan mounted on said shaft within said hood and above said fiue to discharge horizontally against said downwardly diverging hood side walls.

3. A roof ventilator assembly comprising a base plate having a central opening therein and being of such diameter as to permit its being supportedly positioned on a roof curb, a hood having downwardly diverging walls, laterally spaced upwardly projecting hood supports on saidbase plate supporting the hood with its edges spaced vertically from the base plate and inwardly relative to the edge of the base plate so that air discharged from the hood is directed horizontally by the base plate, a flue comprising motor support member mounted on and depending from said base plate in surrounding relation to said central opening therein and to depend from the base plate within a curb on which the base plate is mounted, an annular fan inlet mounted on said base plate in surrounding relation to the opening therein and constituting an extension for said flue, a motor mounted within said motor support member with its axis disposed vertically and its shaft projecting upwardly therefrom into said hood, and a fan mounted on said shaft within said hood and above said flue to discharge horizontally against said downwardly diverging hood side walls.

4. A roof ventilator assembly comprising a base plate having an opening therein and being of such diameter as to permit its being supportedly positioned on a roof curb, a hood comprising a flat top and downwardly diverging side walls, upwardly projecting laterally spaced hood supporting members on said base plate supporting the hood with its edges spaced vertically above and inwardly relative to the edge of the base plate so that air discharged from the hood is directed horizontally by the base plate, a motor support member constituting a flue mounted on said base plate to depend therefrom and in surrounding relation to said opening therein, an annular 4 fan inlet mounted on said base plate in surrounding relation to the opening therein and constituting an extension for said flue, a motor mounted centrally within said motor support member with its shaft disposed vertically and projecting upwardly from the flue, and a centrifugal fan mounted on said shaft within said hood and above said flue to discharge horizontally against said downwardly diverging hood side Walls.

5. A roof ventilator assembly comprising a base plate having an opening therein and being of such diameter as to permit its being supportedly positioned on a roof curb, a hood comprising a flat top and downwardly diverging side walls, upwardly projecting laterally spaced hood supporting members on said base plate supporting the hood with its edges spaced vertically above the base plate, a motor support member constituting a flue mounted on said base plate to depend therefrom and in surrounding relation tosaid opening therein, an annular fan inlet mounted on said. base plate in surrounding relation to the opening therein and constitutingan extension for said flue, a motor mounted centrally within said motor support member with its shaft disposed vertically and projecting upwardly from the flue, and a centrifugal fan mounted on said shaft within said hood and above said flue to discharge horizontally against said downwardly diverging hood side walls.

6. A roof ventilator assembly comprising a base plate having an opening therein and being of such diameter as to permit its being supportedly positioned on a roof curb, a hood having downwardly diverging side walls, upwardly projecting laterally spaced hood supporting members on said base plate supporting the hood with its edges. spaced vertically above and inwardly relative to the edge of the base plate so that air discharged from the hood is directedhorizontally by the base plate, a combined flue and motor support member mounted on said base plate to depend therefrom and in surrounding relation to said opening therein, a motor mounted within said motor support member with its shaft disposed vertically and projecting upwardly from the flue, and a fan mounted on said shaft within said hood and above said flue to discharge horizontally against said downwardly diverging hood side walls.

References Citedin the file of this patent UNITED STATES PATENTS 1,889,117 Adamcikas Nov. 29, 1932 1,157,609 Hopkins May 9, 1939 2,526,290 Solzrnan Oct. 17, 1950 2,582,902. Gohl Jan. 15, 1952 2,638,835 trawsine May 19, 1956 

